*
* Portions Copyright (C) 2001 Compaq Computer Corporation
*
- * ocfs2 symlink handling code, including CDSL support
+ * ocfs2 symlink handling code.
*
* Copyright (C) 2004, 2005 Oracle.
*
return ret;
}
-#ifdef OCFS2_CDSL
-
-struct ocfs2_symlink_ops {
- const char *name;
- const unsigned int len;
- unsigned int (*subst_fn) (char *str, void *data);
-};
-
-/**
- *** sym_hostname - Substitute system host name
- *** @str: String for result
- *** @len: Length of result buffer
- ***
- *** Returns: Length of hostname
- ***/
-static unsigned int
-sym_hostname(char *str, void *data)
-{
- unsigned int l = strlen(system_utsname.nodename);
-
- if (str)
- memcpy(str, system_utsname.nodename, l);
-
- return l;
-}
-
-/**
- *** sym_machine - Substitute machine type
- *** @str: String for result
- *** @len: Length of result buffer
- ***
- *** Returns: Length of machine type
- ***/
-
-static unsigned int
-sym_machine(char *str, void *data)
-{
- unsigned int l = strlen(system_utsname.machine);
-
- if (str)
- memcpy(str, system_utsname.machine, l);
-
- return l;
-}
-
-/**
- *** sym_os - Substitute OS name
- *** @str: String for result
- *** @len: Length of result buffer
- ***
- *** Returns: Length of OS name
- ***/
-
-static unsigned int
-sym_os(char *str, void *data)
-{
- unsigned int l = strlen(system_utsname.sysname);
-
- if (str)
- memcpy(str, system_utsname.sysname, l);
-
- return l;
-}
-
-/**
- *** sym_nodenum - Substitute node number
- *** @str: String for result
- *** @len: Length of result buffer
- ***
- *** Returns: Length of nodeNum
- ***/
-
-static unsigned int
-sym_nodenum(char *str, void *data)
-{
- unsigned int l;
- char buf[10];
- struct inode *inode = data;
- struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
-
- l = sprintf(buf, "%lu", (unsigned long)osb->node_num);
-
- if (str) {
- memcpy(str, buf, l);
- str[l] = '\0';
- }
-
- return l;
-}
-
-static unsigned int
-sym_system(char *str, void *data)
-{
- unsigned int ml = strlen(system_utsname.machine);
- unsigned int sl = strlen(system_utsname.sysname);
- unsigned int l = ml + sl + 1;
-
- if (str) {
- memcpy(str, system_utsname.machine, ml);
- str[ml] = '_';
- memcpy(str + ml + 1, system_utsname.sysname, sl);
- str[l] = '\0';
- };
-
- return l;
-}
-
-static unsigned int
-sym_uid(char *str, void *data)
-{
- unsigned int l;
- char buf[10];
-
- l = sprintf(buf, "%lu", (unsigned long)current->fsuid);
-
- if (str) {
- memcpy(str, buf, l);
- str[l] = '\0';
- }
-
- return l;
-}
-
-static unsigned int
-sym_gid(char *str, void *data)
-{
- unsigned int l;
- char buf[10];
-
- l = sprintf(buf, "%lu", (unsigned long)current->fsgid);
-
- if (str) {
- memcpy(str, buf, l);
- str[l] = '\0';
- }
-
- return l;
-}
-
-static struct ocfs2_symlink_ops symlink_ops[] = {
- {"hostname}", 9, sym_hostname},
- {"mach}", 5, sym_machine},
- {"os}", 3, sym_os},
- {"nodenum}", 8, sym_nodenum},
- {"sys}", 4, sym_system},
- {"uid}", 4, sym_uid},
- {"gid}", 4, sym_gid},
- {NULL, 0, NULL}
-};
-
-
-/**
- *** ocfs2_link_expand - Expand a context sensitive symlink
- *** @ops: The symlink substitution operations table
- *** @out: Buffer to place result in
- *** @in: Buffer to get symlink from
- ***
- *** Returns: 0 or error code
- ***/
-
-static void ocfs2_link_expand(struct ocfs2_symlink_ops *ops, char *out, char *in, struct inode *inode)
-{
- unsigned int i;
-
- while (*in) {
- *out++ = *in;
- if (*in++ != '{')
- continue;
-
- for (i = 0; ops[i].name; i++) {
- if (memcmp(in, ops[i].name, ops[i].len) == 0) {
- out--;
- out += ops[i].subst_fn(out, inode);
- in += ops[i].len;
- }
- }
- }
-
- *out = 0;
-}
-
-
-/**
- *** ocfs2_link_size - Return expanded size required to store a symlink
- *** @str: The symlink
- *** @ops: The symlink substitution operations table
- ***
- *** Returns: The size of the expanded symlink.
- ***/
-
-
-static unsigned int ocfs2_link_size(struct ocfs2_symlink_ops *ops, char *str, struct inode *inode)
-{
- unsigned int len = 0;
- unsigned int i;
-
- while (*str) {
- len++;
- if (*str++ != '{')
- continue;
-
- for (i = 0; ops[i].name; i++) {
- if (memcmp(str, ops[i].name, ops[i].len) == 0) {
- len--;
- len += ops[i].subst_fn(NULL, inode);
- str += ops[i].len;
- break;
- }
- }
- }
-
- return len + 1;
-}
-
-static inline int ocfs2_cdsl_follow_link(struct nameidata *nd,
- char *old_link,
- struct inode *inode)
-{
- int status;
- char *new_link;
- unsigned int len;
-
- len = ocfs2_link_size(symlink_ops, old_link, inode);
- new_link = kmalloc(len, GFP_KERNEL);
- if (new_link == NULL) {
- status = -ENOMEM;
- mlog_errno(status);
- goto bail;
- }
-
- ocfs2_link_expand(symlink_ops, new_link, old_link, inode);
-
- status = vfs_follow_link(nd, new_link);
- if (status < 0)
- mlog_errno(status);
-
- kfree(new_link);
-bail:
- return status;
-}
-#endif
-
static void *ocfs2_follow_link(struct dentry *dentry,
struct nameidata *nd)
{
goto bail;
}
-#ifdef OCFS2_CDSL
- status = ocfs2_cdsl_follow_link(nd, link, inode);
-#else
status = vfs_follow_link(nd, link);
-#endif
if (status)
mlog_errno(status);
bail:
projects / linux-flexiantxendom0-3.2.10.git / blobdiff